1325287 九、發明說明： 優先權主張 本申請書主張在2005年6月20曰於韓國智慧財產局 (Korean Intellectual Property Office)提出的韓國專利申請 " 書（號碼為2005-53161)的優先權，其中所揭露的内容可作 為本申請書的參考_。 【發明所屬之技術領域】 本發明係有關用於冷陰極燈管（cold cathode 馨fluorescent lamp，簡稱CCFL)之驅動裝置，且尤甚者，係 有關用於能輕易提供啟動燈管所需要的高輸出之驅動裝 置。. 【先前技術】 ： .冷陰極燈管（CCFL)具有覆蓋在玻璃管内壁上的螢光 "材料。CCFL具有附著在管子兩個末端的電極，.其中數十 陶爾（Torr)的氣體混合物與預先诀定數量的水銀密封在裡 •面。CCFL擁有很多的優點，像是高亮度、高色彩的表現、 2.0瓦（W)至5.0 '瓦低電力的消耗、在固定燈管電流下， 15000小時至60000小時長時間的使用壽命。因此，它是 - - . · 很好利用的並可以在LCD背光模組中當作照明裝置。 _ 然而，一但燈管點燃而卻沒有提供電流與較小的阻抗 , 、 (impedance)，CCFL就會展示出大的阻抗。因此，啟動燈 管需要至少1300伏特（V)的高電場能量以及一但燈管點燃 大約需要800伏特的.電壓。 因此，用於CCFL之驅動裝置應該依照燈管開啟/燈管 5 93488修正版 關閉情況而提供適當的電場能量。[本文中：「開啟」表示 .通電或導通（0n)，「關閉」表示熄滅或不通電（off)] 第1圖係說明用於CCFL之驅動裝置的電路圖。參考 第1圖，用於CCFL 10之驅動裝置包含：用於提供參考信 唬的振盪器11 ;藉由一個預先決定的比例用於將從振盪器 11輸出參考信號分開的一個脈波寬度調變（pulse width modulation，簡稱PWM)裝置12，並將分割信號與pwM調 光（dimming)控制信號比較，其中pWM調光控制信號是從 卜。具有開/關已調整之責務比（duty rate)的pwM切換 ，關（switching ’本文中有簡稱為「切換」之情形）控制信 唬的輸出所提供；用於切換開/關以回應從pWM驅動器輸 出的切換控制開關信號與反向直流電進入預先決定頻率之 父八電之切換控制彳§號輸出的換流器，有稱為反 向器，反相器，或換流器等的情形，本文中稱為換流器）13; 以及用於輸出從換流器13輸出至燈管10預先決定頻率之 交渌電的一個共振電路14。 換流盗13包含一個半橋結構的兩個切換開關裝置 SW1與SW2，其中半橋結構串聯在電流輸入端與地面之 間。切換開關裝置SW1與SW2交替地切換開/關以輸出預 先決定頻率的交流電。提供從換流器13輸出的交流電會通 過共振電路14而至燈管1〇。 …一個PWM控制器12將從振盪器n輸出預先決定頻 率的參考信號分開-半，並調整分隔信號的開/關責務比以 回應PWM控制信號VpwM而控制燈管1〇亮度。 93488修正版 6 1325287 f詩這㈣構的⑽㈣置下，藉由僅控制 二M控制15 12之切換開關裝置SW1與SW2的開/ 比與Μ換流器13的㈣開關速度而獲得啟動燈 官所需要的高電場能量。 的時：圖=於解輪動燈管，傳統咖驅動功能 盘’、⑷與（b)疋各自提供給切換開關裝置SW1 Μ ΓπΓ換開關控龍號，而⑷是假使提供切換電流 m涔，提供給燈管10的輪出電流。參考第2圖⑷ 二（）’傳統上’假如燈管需要點燃，提供—個最大責務比 的切換控制信號至換流器直到燈、' 點燃的情況。在燈管10點㈣滅的情況轉至 指定的亮度而調整。.，，、後貝務比㈣响會依照 =而，叙使如上述使用半橋結構的換流器13,兩個切 大％Ls:，lW2應該不會在同一個 電二二:0/°或更少。這使得滿足啟動燈管所需要的 同樣的’假使用於啟動燈管的電壓不能 【發不穩疋的運作像是在樣。 =發明是用來解決上述先前技術的問題而因發明 輪出的冷陰極燈管(心 ，據-個用來了解本發明目標的方面，本發明提供用 用L之驅動裝置’包括：基於調譜電阻與調諧電容而 .於振邊的振盪H ’·藉由—個預先決定的比例用於將從振 93488修正版 丄J厶J厶〇 / 盪w 11輸出參考# 5虎分開的一個脈波寬度調變（p ，並 調整分割信號的開/關責務比以回應控制亮度以產生切換 控制信號的PWM控制信號；用於反向直流電至預先決定 頻率之交流電的換流器’換流器包含半橋_制㈣結構 的複數個切換開關裳置，其半橋結構可交替地切換開與關 乂回應從PWM驅動器輸出的切換控制信號；用於輸出從 換流器輸出之交流電的共振電路以作為燈管驅動電壓；用 於偵測燈管之熄滅的回授電路，其通過提供給燈管的電壓 回授並根據熄減㈣測，輸出電流控制信號；與用於控制 電流數夏流動在振簠器之調譜電容的電流控制器以回應回 ^電路的想滅偵測信號，所以在點燃情況下，流動通過燈 g的調㈤電谷電流會高於在熄滅情況下，流動通過燈管 調諧電容電流。 【實施方式】 本發明較佳的實施例將參考伴隨㈣式而詳細的描 述0 • . * · • * - 第3圖係說明本發明用於冷陰.極燈管（CCFL)之驅動襞 置完整結構的方塊圖。 • · · ' . . .· · 參考第3圖’本發明用於CCFL之驅動裝置包含基於 調譜電阻（她ing resistor)與調諧電容（tuning以响⑽而 。用於RC·.振盪的振盪器31，·回應控制亮度的pwM控制信 =藉由預先衫的比㈣於從減賴加動信號的脈 波見度調變㈣卿動$ 32，調整分割信號的開/關責務 比以產生切換控制信號；用於反向直流電至預先決定頻率 93488修正版 之交流電的換流器，換流器包含半橋結構的複數個切換開 -裝置SW1與SW2，其半橋結構回應從J>WM驅動器 _ 出的切換控制信號而交替地切換開與關；用於輸出從換 ••流器33輸出至燈管3〇之預先決定頻率之交流電的共振電 路34，用於經由提供至燈管3〇的回授電壓而偵測燈管熄 滅的回授電路35 ;以及若提供燈管關閉情況的信號指示， =於增加振盪器31電容電流，以及若提供燈管開啟情況的1325287 IX. Invention Description: Priority Claim This application claims the priority of the Korean Patent Application " (2005-53161) filed on June 20, 2005 in the Korean Intellectual Property Office. The content disclosed therein can be used as a reference for this application. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a cold cathode fluorescent lamp (CCFL), and more particularly, to a high level for being able to easily provide a starting lamp. Output drive. [Prior Art]: A cold cathode fluorescent lamp (CCFL) has a fluorescent material that covers the inner wall of a glass tube. The CCFL has electrodes attached to both ends of the tube, of which dozens of Torr gas mixtures are sealed with a predetermined amount of mercury. CCFL has many advantages, such as high brightness, high color performance, low power consumption from 2.0 watts (W) to 5.0 watts, and a long life of 15,000 hours to 60,000 hours at a fixed lamp current. Therefore, it is - - . . . It is well utilized and can be used as a lighting device in LCD backlight modules. _ However, once the lamp is ignited but does not provide current and a small impedance, the CCFL will exhibit a large impedance. Therefore, starting the lamp requires a high electric field energy of at least 1300 volts (V) and a voltage of about 800 volts is required for the lamp to ignite. Therefore, the drive for the CCFL should provide the appropriate electric field energy in accordance with the lamp opening/lamp 5 93488 revision off condition. [In this document: "ON" means power on or on (0n), "off" means off or off (off). Fig. 1 is a circuit diagram showing a driving device for a CCFL. Referring to Figure 1, the driving device for CCFL 10 includes: an oscillator 11 for providing a reference signal; a pulse width modulation for separating the reference signal output from the oscillator 11 by a predetermined ratio A pulse width modulation (PWM) device 12 compares the split signal with a pwM dimming control signal, wherein the pWM dimming control signal is a slave. PwM switching with on/off adjusted duty ratio, off (switching 'in this case, simply referred to as "switching") is provided by the control signal output; used to switch on/off in response to pWM The switching control switch signal of the driver output and the reverse direct current enter the switching frequency of the parent frequency of the predetermined frequency. The converter of the output of the 彳 § is called an inverter, an inverter, or an inverter. This is referred to herein as an inverter 13; and a resonant circuit 14 for outputting the output from the inverter 13 to the lamp 10 to determine the frequency of the switching. The commutation thief 13 comprises two switching devices SW1 and SW2 of a half-bridge structure, wherein the half-bridge structure is connected in series between the current input terminal and the ground. The switching device SW1 and SW2 are alternately switched on/off to output an alternating current of a predetermined frequency. The alternating current supplied from the inverter 13 is supplied to the bulb 1 through the resonance circuit 14. A PWM controller 12 separates the reference signal outputting the predetermined frequency from the oscillator n by a half, and adjusts the on/off duty ratio of the divided signal to control the brightness of the lamp 1 in response to the PWM control signal VpwM. 93488 Rev. 6 1325287 f (4) (4) Set up, by controlling only the opening/closing ratio of the switching devices SW1 and SW2 of the two M control 15 12 and the (four) switching speed of the xenon converter 13 to obtain the start lamp officer The high electric field energy required. When: Figure = in the solution of the rotating lamp, the traditional coffee drive function disk ', (4) and (b) 疋 are each provided to the switch device SW1 Μ Γ π Γ change the switch control number, and (4) is to provide the switching current m涔, The current supplied to the lamp tube 10 is taken. Refer to Figure 2 (4). Two () 'Traditionally, if the lamp needs to be ignited, provide the maximum duty ratio switching control signal to the inverter until the lamp, 'ignition. When the lamp is turned off at 10 o'clock (4), it is adjusted to the specified brightness. .,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ° or less. This makes it possible to meet the same 'supplied voltage used to start the lamp that is required to start the lamp. [The unstable operation is like this. The invention is a cold cathode lamp used to solve the above-mentioned problems of the prior art and which has been invented by the invention (the present invention provides a driving device for using L according to an aspect for understanding the object of the present invention) includes: Spectral resistance and tuning capacitance. The oscillation of the vibration side H '· is used by a predetermined ratio for the correction of the vibration 93488 丄J厶J厶〇/ w w 11 output reference # 5 tiger separate pulse Wave width modulation (p, and adjusting the on/off duty ratio of the split signal in response to the PWM control signal for controlling the brightness to generate the switching control signal; the converter 'inverter for the reverse direct current to the alternating current of the predetermined frequency A plurality of switch switches including a half bridge _ system (four) structure are disposed, and the half bridge structure alternately switches between switching on and off to respond to a switching control signal output from the PWM driver; and a resonant circuit for outputting an alternating current output from the inverter As a lamp driving voltage; a feedback circuit for detecting the extinction of the lamp, which is fed back by the voltage supplied to the lamp and outputs a current control signal according to the extinction (four); and is used to control the current number of summer The current controller that moves the modulation capacitor of the vibrator responds to the detection signal of the return circuit, so in the case of ignition, the current flowing through the lamp g (five) is higher than that in the case of extinction. The capacitor current is tuned by the lamp. [Embodiment] A preferred embodiment of the present invention will be described in detail with reference to the equation (4). * * * * * - Figure 3 illustrates the invention for cold cathode lamp (CCFL) Drives the block diagram of the complete structure. • · · · · · · Refer to Figure 3 'The driving device for CCFL of the present invention includes based on the grading resistor and tuning capacitor (tuning) In response to (10), the oscillator 31 for RC·. oscillation, the pwM control signal in response to the control brightness = by the ratio of the pre-shirt (4) to the pulse wave modulation from the subtraction of the boost signal (4) 32. Adjusting an on/off duty ratio of the divided signal to generate a switching control signal; an inverter for reversing direct current to an alternating current of a predetermined frequency 93498, the inverter includes a plurality of switching on-devices of a half bridge structure SW1 and SW2, whose half-bridge structure responds from J> The switching control signal of the WM driver _ is alternately switched on and off; a resonant circuit 34 for outputting an alternating current output from the converter 33 to a predetermined frequency of the lamp 3 , for supplying to the lamp via 3回 feedback voltage to detect the lamp off the feedback circuit 35; and if the signal indication of the lamp off condition is provided, = increase the capacitor current of the oscillator 31, and if the lamp is turned on
°虎#曰示降低振I器31電容電流至一個參考位準的電流 零控制器36。. "L 振盪器31是一個一般的RC振盪器，而藉由在振盪器 • 31的调諧電阻（沒有顯示於圖中）與調諧電容（沒、有顯示於 2中決定振盪頻率。此外，振盪器31的振盪頻率是與調 咕電谷成比例钓增加。也就是，提供給振盪器31之調諧電 容電流的增加也導致了振盪頻率的增加。這樣RC振盪器 的特色在本領域中是眾所皆知的。 • 本發明用於CCFL·之驅動裝置更進一步的包含回授電 路35與電流控制器36。提供給振盪器31之偏壓電流會依 .照燈管開/關情況而變化以修改從振盪器31輸出的頻率。 2果，換流器33的切換開關速度會更進一步的加速直到燈 官從消滅的情況開啟以提供啟動燈管3〇所需的電場能量。 至於PWM驅動器32’數字321 (並沒有解釋於太中） 代表Td分割產生器（divider_Td generat〇r)，其將從振盪器 31提供的頻率分開一半並產生pWM切換信號。同樣地， 邏輯裝置322-324是用於邏輯地結合從具有pwM控制信 93488修正版 9 丄奶287 ，vPWM之Td分割產生器321輸出之參考時脈的方法，其 P W Μ控制信號是亮度控制信號以調整p w %切換信號的 開/關責務比。及閘（and gate)325、326邏輯地結合燈管3 〇 =何錯*的控制信號Vc指示與PWM切換信號。假如提供 =錯誤的控制信號(如邏輯0)指示，輪出邏輯。以停止換 ，器33的切換運作。pWM驅動器32是相等地裝配於傳統 勺PWM驅動器而且可以不同地裝配。 .士第4圖係說明本發明用於CCFL之啟動驅動裝置運作 的^•序圖。在第4圖，⑷顯示從振盪器輪出的參考作 號，⑻與（c)顯示從pwM驅動器32提供至換流器的兩個 切換，關裝置SW1與SW2的切換開關控制信號，以及⑷ 顯不藉由共振電路34提供給燈管30的驅動電壓。 —^第4圖所示，在本發明用於CCFL之驅動裝置中， 右且官30需要被點燃.，振盖器31會輸出一個比在燈管開 =況下更高頻率的信號。基於較高頻率的信號，—Μ驅 ，态32控制換流器33的切換開關運作。因此，隨著換流 :33切換開關速度的增加，提供至燈管3〇 •出電壓： 曰增加。此外，若燈管是已點燃的，振盪器3ι合輸出一個 比：發光之前更低的頻率.。基於較低的頻率運；；漏驅 動益32與換流器33，.而更慢的切換開觸。結果，在严其 況下輸出至，燈管30的電壓會小於在燈管媳 憬況下輪出至燈管的電壓。 上述在燈管點燃的情況下，振.盪器31的輪出頻率是 一固為了用於CCFL之-般驅動裳置設定的參考頻率。在 93488修正版 10 1325287 燈管熄滅的情況下，振盪器3 1的輸出頻率是高於參考頻率 的。實際上，藉由設定在燈管熄滅的情況下之頻率是在燈 管發光的情況下之頻率的1.5倍以達到啟動燈管30所需的 電壓位準。 接著，至於本發明用於CCFL之驅動裝置的一個範例 將會更詳細的介紹用於調整振盪器31頻率與電流控制器 36的回授電路35〇 第5圖係說明本發明用於CCFL之驅動裝置電流控制 籲器36的詳細電路圖。 參考第5圖，電流控制器36包含用於接收參考電壓 Vref的緩衝器.361;—個具有通過電阻RT而接地之射極端 (emitter terminal)與連接至缓衝器361輸出之基極（base)的 '第一電晶體Q1 ;電流中繼器（repeater)362包含一個具有基 極與集極（collector)共同連接至第一電晶體Q1集極的第二 電晶體Q2,以及分別具有基極與射極各自共同連接至第二 鲁電晶體Q2的基極與射極的第三電晶體Q3與第四電晶體 Q4 ; —個用於操作開/關的第五電晶體Q5以回應電流控制 信號Fc，第五電晶體的.集極-射極達接在第三電晶體Q3的 集極與地面之間；第一電流鏡(current mirror)363包含具有 —一個射極接地且集極與基極連接至第三電晶體之集極的第 六電晶體Q6，一個射極接地且基極連接至第三電晶體之集 極的第七電晶體Q7 ; —個第二電流鏡364包含具有一個射 極接地且集極與基極連接至第四電晶體之集極的第八電晶 體Q8, 一個射極接地且基極連接至第四電晶體之集極的第 11 93488修正版 1325287 九電晶體Q9 ;以及一個第三電流鏡3 65包含具有集極與基 極共同連接至第七與第九電機體Q7、Q9集極的第十電晶 體Q10與具有基極-射極連接至第十電晶體Q10且集極連 接至振盪器31之調諧電容（沒有顯示於圖中）的第十一電晶 體 Q11。 至於如上述所裝配電流控制器36的運作，首先，藉由 參考電壓Vref與電阻RT決定電流中繼器3 62的參考電流 Iref。茶考電流Iref表不成下面的方程式1· IREF=— ; 方程式 1 -°虎# indicates the current that reduces the capacitor current of the oscillator 31 to a reference level. The L oscillator 31 is a general RC oscillator, and is tuned by the tuning resistor (not shown in the figure) and the tuning capacitor (not shown in 2). The oscillation frequency of the oscillator 31 is increased in proportion to the tuning valley. That is, the increase in the tuning capacitor current supplied to the oscillator 31 also causes an increase in the oscillation frequency. Thus, the characteristics of the RC oscillator are in the art. It is well known that the driving device for CCFL of the present invention further includes a feedback circuit 35 and a current controller 36. The bias current supplied to the oscillator 31 depends on the on/off condition of the lamp. The change is to modify the frequency output from the oscillator 31. 2, the switching speed of the inverter 33 will be further accelerated until the lamp is turned on from the extinguished condition to provide the electric field energy required to start the lamp. The PWM driver 32' digital 321 (not explained in the middle) represents a Td split generator (divider_Td generat〇r) which splits the frequency supplied from the oscillator 31 by half and generates a pWM switching signal. Similarly, the logic is loaded. 322-324 is a method for logically combining a reference clock outputted from a Td splitter generator 321 having a pwM control letter 93488, and a PW Μ control signal is a brightness control signal to adjust pw %. Switching signal on/off duty ratio. And gates 325, 326 are logically combined with lamp 3 〇 = what is wrong * control signal Vc is indicated with PWM switching signal. If provided = wrong control signal (such as logic 0) Instructed to turn the logic out. To stop the switching, the switching operation of the device 33. The pWM driver 32 is equally mounted to the conventional scoop PWM driver and can be assembled differently. Figure 4 illustrates the driving of the present invention for CCFL. The sequence diagram of the operation of the device. In Fig. 4, (4) shows the reference number that is rotated from the oscillator, and (8) and (c) show the two switches from the pwM driver 32 to the inverter, and the switches SW1 and SW2 are turned off. The switch control signal, and (4) the driving voltage supplied to the lamp 30 by the resonance circuit 34. As shown in Fig. 4, in the driving device for CCFL of the present invention, the right and the official 30 need to be ignited. The vibrator 31 will output a ratio Lamp with higher frequency signal. Based on the higher frequency signal, the mode switch 32 controls the switching operation of the inverter 33. Therefore, as the commutation: 33 switching switch speed increases, provide To the lamp 3 〇 • output voltage: 曰 increase. In addition, if the lamp is ignited, the oscillator 3 ι outputs a ratio lower than: before the illuminating. Based on the lower frequency; The switch is switched more slowly with the inverter 33. As a result, under severe conditions, the voltage of the lamp 30 will be less than the voltage that is turned to the lamp under the condition of the lamp. In the case where the lamp is ignited, the frequency of the pulsator 31 is a reference frequency for the general drive setting of the CCFL. In the case of the 93488 Rev. 10 1325287 lamp being turned off, the output frequency of the oscillator 3 1 is higher than the reference frequency. In practice, the voltage level required to activate the lamp tube 30 is reached by setting the frequency at which the lamp is extinguished to be 1.5 times the frequency at which the lamp is illuminated. Next, as an example of the driving device for CCFL of the present invention, the feedback circuit 35 for adjusting the frequency and current controller 36 of the oscillator 31 will be described in more detail. FIG. 5 is a diagram showing the driving of the present invention for CCFL. A detailed circuit diagram of the device current control caller 36. Referring to FIG. 5, the current controller 36 includes a buffer 361 for receiving the reference voltage Vref; an emitter terminal having a ground through the resistor RT and a base connected to the output of the buffer 361 (base) 'First transistor Q1; current repeater 362 includes a second transistor Q2 having a base and a collector connected in common to the collector of the first transistor Q1, and having a base respectively a third transistor Q3 and a fourth transistor Q4 each connected to the base and the emitter of the second Lu crystal Q2 together with the emitter; a fifth transistor Q5 for operating the on/off in response to current control The signal Fc, the collector-emitter of the fifth transistor is connected between the collector of the third transistor Q3 and the ground; the first current mirror 363 includes - an emitter ground and a collector a sixth transistor Q6 whose base is connected to the collector of the third transistor, a seventh transistor Q7 whose emitter is grounded and whose base is connected to the collector of the third transistor; a second current mirror 364 includes An emitter grounded and the collector and base connected to the collector of the fourth transistor a transistor Q8, an eleventh transistor Q9 having an emitter grounded and a base connected to the collector of the fourth transistor, and a third current mirror 365 having a collector and a base connected in common thereto The tenth transistor Q10 of the seventh and ninth motor bodies Q7, Q9 collector and the tuning capacitor having the base-emitter connected to the tenth transistor Q10 and the collector connected to the oscillator 31 (not shown) The eleventh transistor Q11. As for the operation of the current controller 36 as described above, first, the reference current Iref of the current repeater 3 62 is determined by the reference voltage Vref and the resistance RT. The tea test current Iref does not form the following equation 1. IREF=— ; Equation 1 -
電流是幾乎完全相似於流動在第三電晶體Q3與第四 電晶體Q4集極的參考電流IR。從這裡開始，第三電晶體' Q3的集極電流稱為開始電流I start 而 第四電晶體Q4的集極 電流稱為正常電流Inormal。 此外，決定第一電流鏡.363的運作以回應從回授電路 35的電流控制信號FC。也就是，在燈管關閉的情況，若. 從回授電路35提供低位準的電流控制信號.FC，.第五電晶 體Q5,會關閉而輸入開始電流Istart當作第一電流鏡363的· 參考電流。然後，藉由第一電流鏡3 63，開始電流Istart轉 移至第三電流鏡36^相反的，在燈管開啟的情況，若從回 授電路35提供高位準.的電流控制信號FC，第五電晶體Q5 會開啟以繞過流動在第三電晶體Q3集極至地面的開始電 流Istart。結果，第一電流鏡363不會運作而開始電流Istart 不會反射在第三電流鏡365。 12 . 93488修正版 1325287 在這個時後，第二電流鏡364提供電流In〇mai流動在 第四電晶體Q4的集極至第三電流鏡365的第十電晶體 Q10。 曰曰- 後，第二電流鏡365反射了電流並輸入至第三電济 鏡365的第十電晶體Q10，並提供與振屋器調諧電容一= 的電流ICT。 . ’ 結果，第三電流鏡365的輸出電流在燈管開啟的情況 下表示成方程式Ict=Inc)rmal而在燈管關閉的情況下表示成 方私式Ict=I_al+Istart。在本文中，振盪器31的輸出頻率 或振盪頻率與提供給調諳電容的電流ICT成比例。因此， 在燈管開啟情況下的振錢率是高於在燈管關閉情況 振逢頻率。 乂。如上述，'從振盪器30輸出的較高振盪頻率增加了換流 斋33的切換速度與隨後共振電路34的輪出電壓。 回授電路35檢查了燈管的電壓以保證如上述之電流 _控制器36的運作，判定燈營县左叫弘+ B 1 蒙 .思开.句疋燈g疋在開啟或關閉情況，然後提 供電流控制信號Fc給電流控制器36。 、因此，在啟動燈管30時，振盈器30輸出一個高的振 蘆頻率直到燈管開啟。這加速了換流器33的㈣速度 升了提供給燈管30到可以啟動燈管3〇適當位準的^雷 壓（約1300.伏特）。同樣地，若藉由 厂 ’ 、 右稭由同輸出電壓與低阻抗可 以開啟燈f，回授電路35會偵測到並輸出含 心號FO运減少了振盈器3〇的_率並減少了換流 H3的切換速度’並在燈管開啟情況下調整提供給燈管 93488修正版 13 30到一個需要位準的輸出電壓（約800伏特）。The current is almost completely similar to the reference current IR flowing in the collectors of the third transistor Q3 and the fourth transistor Q4. From here on, the collector current of the third transistor 'Q3' is called the start current I start and the collector current of the fourth transistor Q4 is called the normal current Inormal. In addition, the operation of the first current mirror .363 is determined in response to the current control signal FC from the feedback circuit 35. That is, in the case where the lamp is turned off, if the low-level current control signal .FC is supplied from the feedback circuit 35, the fifth transistor Q5 is turned off and the input start current Istart is regarded as the first current mirror 363. Reference current. Then, by the first current mirror 3 63, the start current Istart is transferred to the third current mirror 36^, and in the case where the lamp is turned on, if the high-level current control signal FC is supplied from the feedback circuit 35, the fifth The transistor Q5 is turned on to bypass the starting current Istart flowing to the collector of the third transistor Q3 to the ground. As a result, the first current mirror 363 does not operate and the starting current Istart is not reflected at the third current mirror 365. 12. 93488 Rev. 1325287 After this time, the second current mirror 364 provides a current In〇mai flowing in the collector of the fourth transistor Q4 to the tenth transistor Q10 of the third current mirror 365. After 曰曰-, the second current mirror 365 reflects the current and inputs it to the tenth transistor Q10 of the third electromagnet 365, and provides a current ICT with the tuned capacitor of the gyrator. As a result, the output current of the third current mirror 365 is expressed as the equation Ict=Inc) rmal in the case where the lamp is turned on, and is expressed as the square private Ict=I_al+Istart in the case where the lamp is turned off. Herein, the output frequency or oscillation frequency of the oscillator 31 is proportional to the current ICT supplied to the tuning capacitor. Therefore, the vibration rate in the case where the lamp is turned on is higher than the resonance frequency in the case where the lamp is turned off. Hey. As described above, 'the higher oscillation frequency output from the oscillator 30 increases the switching speed of the commutation 33 and the subsequent rotation voltage of the resonance circuit 34. The feedback circuit 35 checks the voltage of the lamp to ensure the operation of the current_controller 36 as described above, and determines that the lamp Yingxian left is called Hong+B1, and the sentence is turned on or off, then A current control signal Fc is provided to the current controller 36. Therefore, when the lamp tube 30 is activated, the vibrator 30 outputs a high frequency of the reed until the lamp is turned on. This speeds up the (four) speed of the inverter 33 and provides a lightning pressure (about 1300 volts) that is supplied to the lamp tube 30 to an appropriate level at which the lamp tube 3 can be activated. Similarly, if the lamp f is turned on by the factory's and right straws with the same output voltage and low impedance, the feedback circuit 35 will detect and output the heart-numbered FO, which reduces the _ rate of the vibrator and reduces The switching speed of the commutating H3 is adjusted and supplied to the lamp 93488 modified version 13 30 to a desired level of output voltage (about 800 volts) when the lamp is turned on.
用於如上述之一個回授電路35範例的電路圖。 用於伯測燈管開啟/關閉情況的回授電路包含一個第 較益35卜用於比較提供給燈f 3G 特)與參考電華2·5伏特）；一個„ 352，用 超過2.5伏特時開啟開關以及在電屢0VP小於25伏 開關以回應第一比較器351的比較結果；一個電 ^源353通過開關352與通過電容^而接地；一個 比較器354，用於比較電流來源353的接觸電|，電容c ^有參考電塵0.7V的開關352，而若接觸大於參考 〇電爾出邏輯i，若接觸電遂小於參考電塵則輸出邏輯 :’二及-個RS鎖存器355(1祕），具有一個輸入端Μ 制較器3 5 4的輸出與—個輸出端Q連接至電流控 制斋36的弟五電晶體。 在燈管關閉（lamp-out)的情況，輸入㈣〇vp至第一 比較器35!而轉向低位準（约25V或更少）。因此，第一比 f器351 _出變成低位準，所以開.關352關閉而提供電 机來源说的電流給電容c。因此，充電於電容e的· 增加卞第，比較盗354的輸出.變成高位準(邏輯1)。隨著輸 八邏輯1，RS鎖存& 355輸出低位準信號。也.就是，提供 電流控制信號FC至電流控制器36而轉向低位準。 相反的在燈管開啟的情況，輸入電壓OVP至第一比 較态351變成麥考位準或更高(約2·5ν”因此開啟開關。 若開關352開啟’從電流來源提供的電流會繞過至地面而 93488修正版 電容c的電壓會幾乎降到0。因此，第二比較器354 =低=信號（邏輯_RS鎖存器355的輸出轉向高位 L也就疋’提供給電流控制器36的電流控制信 成高位準。 交 k的力此’回杈電路35提供燈管開/ 況的電流控制俨號Fr扣-π J m 利卩^FC指不至電流控制器36。 1 里第7圖係說明本發明用於CCFL之驅動裝置之模擬結 果的圖表。 ''' 第7(a)圖係、說明假設啟動本發明用於之驅動裳 ^仗回授電路35提供至電流控制器％的電流控制信號 若射3G沒有被㈣，輸出低位準信號而在燈管點 燃後’輸出高位準信號。 ”” 第7(b)圖係說明假設啟動本發明用於⑽匕之驅動裝 =玄攸振盟531輸出的頻率信號。在燈管關閉的情況下的 頻率是高於在燈管開啟的情況下的頻率。 >另外，第7圖⑷與⑷各自說明依據本發明用於⑺孔 ^驅動裝置’提供切換控制信號至驅動裝置之換流器33 、：換裝置SW1與SW2。當燈管3〇需要倍點燃時，從一 :時間點輸出一個脈波型態的切換控制信號。在燈管開啟 別的脈波週期是短於在燈管開啟後的脈波週期。脈波週期 對應於切換速度。前述的模擬圖表保證能了解如上述甩於 CCFL之驅動裝置的各項功能。 如之别所提出’根據本發明，在燈管關閉情況下，半 橋、、。構換“的切換速度是增加的，所以啟動燈管所需要 93488修正版 15 UZJZ6/ UZJZ6/ 步的讓燈管可以穩 的電壓位準可以輕易地被滿足並更近— 定的點燃。 雖然本發明顯示與描述於一些較佳的實施例，但是對 ㈣知本技術領域的人來說，在不脫離由附加的申請專利 把圍所^義之本發明的精神與範圍下，製造本發明的修改 物與變化型會是很明顯的。 ' 【圖式簡單說明】 從下列詳盡的描述與伴隨的圖式，將會更清楚的了解 ^發明上述與其他目標、特色與其他優點，而以下為圖式 况明： 第1圖係說明先前技術用-於冷陰極燈管(CCFL)之驅動 裝置的電路圖； 士第2圖係說明先前技術用於⑺孔之驅動裝置運作的 第3圖係說明本發明用於CCFL之驅動裝置的方塊圖; 广第4圖係說明本發明用於ccfl之驅動裝置運作的時 序圖； j 时第.5圖係說明本發明用於之驅動裝置電流控制 态的詳細.電路圖； 第6圖係說明本發明用於之驅動裝置路 的詳細電路圖；以及 ^ 的第7圖係說明本發明用於CCFL之驅動裝置模擬結果 的圖表。 【主要元件符號說明】 93488修正版 1325287 10 冷陰極燈管 11 振盪器 12 脈波寬度調變裝置 121 Td分割產生器 122至 126 邏輯閘 13 換流器 14 共振電路 30 冷陰極燈管 31 振盪器 32 脈波寬度調變驅動器 321 Td分割產生器 322至 326 邏輯閘 33 換流器 34 共振電路 35 回授電路 351 第一比較器 • 352 開關 353 電流來源 354 第二比較器 355 RS鎖存器 36 電流控制器 361 緩衝器 362 中繼器 363 第一電流鏡 •364 第二電流鏡 3 65 第三電流鏡 17 93488修正版A circuit diagram for an example of a feedback circuit 35 as described above. The feedback circuit for the opening/closing of the lamp is included in a comparison of the 35th for the comparison of the lamps provided to the lamp f 3G and the reference galvanic 2·5 volts; a „352 for more than 2.5 volts. The switch is turned on and the power is 0VP less than 25 volts in response to the comparison result of the first comparator 351; one source 353 is grounded through the switch 352 and through the capacitor; a comparator 354 is used to compare the contact of the current source 353 Electric |, capacitor c ^ has reference switch 352 of electric dust 0.7V, and if the contact is greater than the reference 〇 electric output logic i, if the contact electric power is less than the reference electric dust, the output logic: 'two and one RS latch 355 (1 secret), with one input terminal, the output of the comparator 3 5 4 and the output terminal Q are connected to the fifth transistor of the current control circuit 36. In the case of the lamp-out, input (4) 〇vp to the first comparator 35! and turn to the low level (about 25V or less). Therefore, the first ratio f 351 _ out becomes a low level, so the opening and closing 352 is closed to provide the current from the motor source Capacitor c. Therefore, the charge of the capacitor e increases, and the output of the 354 is changed. High level (logic 1). With the input of logic 1, the RS latch & 355 outputs a low level signal. Also, the current control signal FC is supplied to the current controller 36 and turned to the low level. In case, the input voltage OVP to the first comparison state 351 becomes the McCaw level or higher (about 2. 5 ν) so the switch is turned on. If the switch 352 is turned on 'the current supplied from the current source will bypass the ground and the 93488 revision The voltage of capacitor c will drop to almost zero. Therefore, the second comparator 354 = low = signal (the output of the logic_RS latch 355 turns to the high bit L and the current control signal supplied to the current controller 36 becomes a high level. The force of the k is the 'return circuit 35 to provide the current control of the lamp on/off. The FFr buckle-π J m 卩^FC refers to the current controller 36. 1 A graph of the simulation results of the driving device of the CCFL. ''' Figure 7(a) is a diagram illustrating the assumption that the driving control device for driving the present invention provides a current control signal to the current controller %. 3G is not (4), output low level signal and then lose after the lamp is ignited High level signal. "" Figure 7(b) illustrates the frequency signal that is assumed to be activated for the drive of (10) 驱动 drive = Xuanzao Zhenmeng 531. The frequency is higher than the lamp when the lamp is off. The frequency in the case where the tube is turned on. In addition, Fig. 7 (4) and (4) each illustrate an inverter 33 for providing a switching control signal to the driving device for the (7) hole driving device according to the present invention, the switching devices SW1 and SW2 When the lamp 3 〇 needs to be ignited, a pulse wave type switching control signal is output from a time point. When the lamp is turned on, the other pulse period is shorter than the pulse period after the lamp is turned on. The pulse period corresponds to the switching speed. The aforementioned simulation chart ensures that the functions of the drive unit as described above in the CCFL can be understood. As suggested by the present invention, according to the present invention, in the case of a closed lamp, a half bridge, . The switching speed of the "change" is increased, so the 93488 modified version of the U.S. UZJZ6/UZJZ6/ step is required to start the lamp. The voltage level of the lamp can be easily satisfied and closer to the ignition. The invention has been shown and described with respect to the preferred embodiments of the preferred embodiments of the present invention, and modifications of the invention may be made without departing from the spirit and scope of the invention. Things and variants will be very obvious. ' [Simple description of the schema] From the following detailed description and accompanying schemas, the above and other objectives, features and other advantages will be more clearly understood. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a driving device for a cold cathode fluorescent lamp (CCFL) used in the prior art; FIG. 2 is a diagram showing the operation of the prior art for the operation of the driving device of the (7) hole. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a block diagram showing the operation of the driving device for the ccfl of the present invention; FIG. 5 is a view showing the details of the current control state of the driving device used in the present invention. Fig. 6 is a detailed circuit diagram showing the driving device path of the present invention; and Fig. 7 is a diagram showing the simulation results of the driving device for the CCFL of the present invention. [Main component symbol description] 93488 revision 1325287 10 Cold cathode lamp 11 Oscillator 12 Pulse width modulation device 121 Td division generator 122 to 126 Logic gate 13 Inverter 14 Resonance circuit 30 Cold cathode lamp 31 Oscillator 32 Pulse width modulation driver 321 Td Split Generators 322 to 326 Logic Gate 33 Converter 34 Resonance Circuit 35 Feedback Circuit 351 First Comparator • 352 Switch 353 Current Source 354 Second Comparator 355 RS Latch 36 Current Controller 361 Buffer 362 Relay 363 first current mirror • 364 second current mirror 3 65 third current mirror 17 93488 revision